Electric cable for burglar-alarm systems.



J. P. WILLIAMS. ELECTRIC CABLE FOR BURGLAR ALARM SYSTEMS. APPLICATION FILED MAR.18, 1909.

961,827,- Patented June 21,1910.

wim STATES rAtrnNr orrroa.

JOHN P. WILLIAMS, OF NEW YORK, N, Y., ASSIGlN'OR T0. ELECTRIC BANK PROTECTION COMP-ANY, A CORPQRATION. OF DELAWARE,

ELECTRIC CABLE EOE, BURGLAR-ALARM SYSTEMS.

Specification of llette s Et e t Patented June 21, 1910.

Application filed March 18, 1909. Serial No. 484,142.

To all whom it may concern: Be it known that I, JOHN P. WILLIAMS, a

' citizen of the United States, and resident of the city of New York, borough of Brooklyn,

in the county of Kings, State of New York,

have invented certain new and useful Improvements Electric Cables for Burglar- A larm ystems, of which the following 1s a specification.

ihis inyention relates to electric cables for burglar-alarm systems, and it has for its object to provide a simple and improved electric cable which will be perfectly protected against cutting of the wires and against the action of heat or flame.

A further object of my invention is to provide an improved cable of the character mentioned, in which the thermostatic elements for protection against heat or'fire will themselves be protected by elements for causing the operation of an alarm signal if an attempt, is made bycu'ttin'g to reach or 'destroythe thermostatic fire-alarm elements,

and whichwill be perfectly protected against ,an.. attempt to either melt or out out the "shellac orother insulating compound with which the wires of the non-thermostatic'ele- 'ments of the burglar-alarm ca'bl'e are coated.

- My improved electric cable is adapted-for 1 use in connection withall types of burglar-.

alarm systems, for the purpose of insuring combined protection both as a burglar-alarm --an ras .va. fire-'alarm,' the thermostatic and other wires {of the cable being suitably connected up with'the signals, bells or other features of the burglar-alarm system, and when employed in connection with a general burglar-alarm--sy-stem will "serve the combined purpose of protection against the -at-:

tempt to either cut or employheat or flame in an attack .upon the cable. My improved cable .is also adapted for effective use in connction with fire-alarm systems, the thermostatic and other wires ofthe cable being connected up with suitable signals, alarms or other features of a general fire-alarm sy's-' v tern, andwhen so employed serves .thecomq bined urpose of protection against either -the action ofheat or flame or an attempt to cut out and f ments.

5 destroy the thermostatic ele- M '.i tj n 'comprises,'in its main features, an' 'electro thermostatic, cable of the class described,-.having .a thermostatic coreembodying circuit wiresfor conductors, and

circuit wires or conductors exterior of the thermostaticcore and arranged outside of or around the same (said exterior wires being preferably wound around the outside surface of the thermostatic core so that they mclose the same), the wires or conductors of both the thermostatic core and the part of the cable exterionthereof being preferably connected 1n multiple and adapted forfconnection to the alarm or signal circuits of the eneral alarm s stem, and it further 'co'm prises other improvedifeatures of construe tion and arrangement, substantially 'ashereinafter described and in the claims.

In the accompanying drawings and the following specification. 1 have illustrated and described one form of the improved electro-thermostatic cable constructed accordlng, to my invention, and have shown particularly indicated and described the same in connection with.

one type of a general alarm system.

In the drawingsFigure 1 is a diagrammatlc vlew showing the cable and its"'ci rcuit connections with the general features of an alarm system. Fig. 2 is a detail side view ofa section of the cable, parts being broken away. Fig. 3 is a detail cross-section, on'an enlarged scale, of the cable.

Corresponding parts in all the figures are denoted by the same reference characters.

Referring tothe drawings, T designates a thermostatic core, which in the construction hereln shown consists of a central wlre or conductor, 1, inclosed within a-surrounding cover ng or shell of fusing metal, 2,

which latter is surrounded by a covering, 3,

erably em by a construction in which the core embo ies fusing metal in combination with the electrical conductors.

- designates the portion of the cable which is exterior of the thermostatic core Rand-which consists of wires or electrical conductors, The wires or electricalconductors constituting the exterior part E may be arranged around or about the thermostatic core T in any suitable or desired manner" Outside of the thermostatic core T against the outside insulated surface 5 thereof, as herein shown, so that they form a network practically surrounding and approximately inclosing the thermostatic elements and constitute an outside covering therefor as well as the exterior conducting elements of the composite cable. I have herein illustrated six of such exterior conducting wires, though it will be understood that the number of such wires may be increased or decreased according to the number of circuits or multiple wires desired. These exterior conductors are respectively indicatedat 6, 7, 8, 9, 10, and 11, and in the arrangement herein shown the conductor 1 of the thermostatic core and the exterior conductor 6 are in multiple, the conductor 4: of the thermostatic core and the exterior conductor 7 are in multiple, the

any suitable flexib e material or armor adapted to protect the cable from mechanical injury without impairing its thermostatic action.

In connecting up the improved electrothermostatic cable with a general alarm system, as herein shown, the conductor 1 ofthe thermostatic core and the exterior conductor 6, which are in multiple, are both connected direct to the positive side of dry batteries and wet batteries, as shown at 15 and 16 respectively, or to other suitable sources of electrical energy, and to one side of the alarm signals or bells of the system, as shown at 17,

and may also be connected to one side of a relay, as at 18, controlling the operation of a mechanical device, as at 19,to which is operatively connected a ong-hammer, as at 20, and to one of a pair 0 insulated plates, as atp p, constituting electrical conductors and formmg a bell-housing or vault lining, said signa s or bellsor mechanically operated hammers or plates being comprised as parts of a general alarm system and located at various points as desired. The conductor-51 of the thermostatic core and the exterior conductor 7, which are in multiple, are con nected to one side of another relay, as at 21, the other side of this relay being connected, as at 22, to the negative side of the dry batteries 15 or other suitable source of electrical energy. Normally, this last-mentioned relay- 21 is in series with the conductors 4 and 7 on the negative side. Said conductors 4 and 7 are also connected to the plate p, of the before-mentioned housing or lining, which is opposite the plate to which the con ductors 1 and 6 are connected.

When a short circuit is made between the conductors 1 or 6 and 1 or 7', the last-mentioned relay 21 is energized and makes a permanent connection with the signals or bells, through the positive conductors 1 or 6, and through the negative return conductors 10 or 11, said'latter conductors 10 and 11 being connected to the side of said relay 21 which is normally open, as at o, and which is closed when a short circuit is made between the conductors 1 or 6 and 4. or 7, and the signals or bells are thus operated by the direct connection thus made to the batteries, the conductors 10 and 11 being connected to the side of the alarm signals or bells which is opposite the connection of the conductors 1 and 6. It will be noted that the conductors 1 or 6 also carry a positive current from the wet batteries or other suitable source of electrical energy; and the exterior conductors 8 or 9 carry the negative return current from the same source. Said'conductors 8 and 9 are also connected to the side of the first-mentioned relay' 18 which is opposite the connections of the conductors 1 and 6. Thus, with the current continuously carried by the conductors 1 or 6 and the conductors 8 or 9, the first-mentioned relay 18, which controls the operation of the mechanical gong-hammer device 19-20, retains said device out of operation, but whencither of said conductors is severed said rela 18 is thrown out of circuit and the mec anical gong-hammer device is released and starts its operation; and the operation of the signals and bells controlled by the conductors 1 or 6,-10 or 11' and 4.- or 7 is likewise effected when a short circuit is established through said last-mentioned conductors, as above exthereby of a short circuit between the con- I ductors.

It will be understood that the insulating sense? material intervening between the conductors is of a character that will fuse or burn at a comparatively low degree of heat and preferab y at a degree lower than that which will melt the fusingimetal 2 The particular advantages derived from using conductors in multiple as herein de: scribed, are that the load carrying capacit of the cable is greatly increased, and the e fective use of very fine wires, which is permissible by reason of'the multiple arrangement here'in'described, renders the cable more sensitive to an attack, as the fine wires are 4 more liable to breakage if a section of the coating 12 of shellac or other suitable insulating material covering them is tampered with or cut out and of course any attempt v to melt the shellac or other insulating covering of the cable will cause the short circuiting operation'by action of the thermostatic COIB- I K -It will be understood that my improved elctro-thermostatic cable, combining the interior thermostatic core elements and the exterior parts constituted byjthe outer conductors or wires surrounding the same, is

adapted for efi'ectlve operatlon in connection with alarm systems working oneither open or closed circuits or on both open and closed circuits. K L s I do not desire to be-understood as limiting myself to the detailed construction and arran eme'nt of parts as herein shown and descri ed, as it 1s manifest that variations and modlfications therein may be resorted to in the adaptation of my invention to varying conditions of use, without departing from the spirit and scope of my invention, and improvements. I therefore reserve the right to all such variations and modifications as properly fall within the scope of my invention and the terms ofthe following claims.

Having thus described my invention, I claim and desire to secure by Letters Patent:

1. An electric cable for alarm systems, comprising a thermostatic ope portion constituting the thermostatic, ivision of the cable and embodying the circuit conductors whiclt,

are thermostatically operatable to cause thesoundlng of the alarm by the action" of heat and a main outer portion constituting a division of\the cable supplementary to said thermostatic portion and? exterior thereof and surrounding the "same andembodying the circuit conductors which are operatable to .cause the sounding of the alarm by sev erance of the conductors, the conductors of a the thermostatic core portion and the conductors of the supplementary outer portion being relatively arranged incircuits having open and closed conditions, whereby when the conductors of both the thermostatic por- 1 I k I be sounded. either by the cutting of the conductors of said main outer division or the action of heat or flame upon said thermostatic division.

2. t An electric cable for alarm systems, comprising a thermostatic core portion constiand embodying the circuit conductors which are thermostatically operatable to cause the sounding of the alarm by the action of heat and a main outer portion constituting a division of the cable supplementary to said thermostatic portion and exterior thereof and surrounding'the same and embodying the circuit conductors which are operatable to cause the sounding of the alarm by severance of the conductors the conductors of the thermostatic portion and the conductors of the OUtGIHPOItIOIl being arran 'ed in multiple and in circuits operatable either by the cutting\of. the conductors or the action of heat or flame.

' tuting the thermostatic division of the cable 3. An electric cablecfor alarmsystems, com- I prising athermostatic' core portion constituting the thermostatic division ofthe cable and embodying the circuit conductors which are thermostatically operatable to cause the sounding of the alarm by the action of heat and a main outer portion constituting a division of the cable supplementary to said thermostatic portion and exterior thereof and surrounding the same and embodying the, circuit conductors which are o eratable to cause the sounding of the alarm by severance'of the conductors, the circuit conductors of said main outer division being Wound around and 3 outside of the thermostatic portion, constituting the thermostatic division and the conductors of, the thermostatic coie portion and the conductors of the supplementary outer portion being rela-' tively arranged in circuits operatable either by the cutting of the conductors or the action of heat or flame, substantially as and for the purpose set forth.

4. An electric cable for alarm systems, comprising-a thermostatic core portion constitutingthe thermostatic division of the cable and embodying the circuit conductors which are thermostatically operatable 'to cause IIO the sounding of the alarm by the action of heat and electrical conductors exterior of r and supplementary to said thermostatic portion constituting the thermostatic division, said exterior supplementary conductors constituting a division of the cable embodying the circuit conductors which are operatable. to cause the sounding of the alarm by severance of the conductors and being arranged to form an inclosure for said thermostatic division,- and the coductors of the thermostatic core portion and the supplementary exterior conductors of the outside inclosure tion and the outer portion of the cablea re being relatively arranged in circuits. operatconnected 1n alarm c rcuits the alarm will able either by the cutting of the' conductors" or the action of heat or flame, substantially as and for the purpose set forth.

5. An electric cable for alarm systems, comprising a thermostatic core portion constituting the thermostaticdivision of the cable and embodying the circuit conductors which are thermostatically operatable to cause the sounding of the alarm by the action of heat and a main outer portion constituting a division of the cable supplementary to said thermostatic portion and exterior thereof and surrounding the same and embodying the circuit conductors which are operatable to cause the sounding of the alarm byseverance of the conductors, the circuit conductors of said main outer portion being braided and Wound around and outside of the thermostatic portion constituting the thermostatic division and arranged to form an inclosure for said thermostatic division, and the conductors of the thermostatic core portion and the conductors of therlsupplementary outer portion being relatively arranged in circuits operatable either by the cutting of the conductors or the action of heat or flame, substantially as and for the purpose set forth.

6. An electric cable for alarm systems, comprising a. thermostatic portion constituting the thermostatic division of the cable and embodying electrical conductors the fusing or contact of which will operate an alarm circuit,-and a main ortion constituting a division of the cab e supplementary to said therlnostaticportion and protecting the same and'embodying electrical conductors the severing of which will operate an alarm circuit, whereby the thermostatic division of the cable is protected independent of its thermostatic action. a

7. An electric cable for alarm systems, comprisingfiwo distinct divisions, one division bein a main portion embodying circuit con 'uctors which are operatable to cause the sounding of the alarm byseverance of the conductors, and the other division being a thermostatic portion embodying cir cuit conductors operatable to cause the sounding'of the alarm by the action-of heat, said distinct divisions being relatively associated so that one-incloses or protects the other and the conductors of the thermostatic division and the conductors of the main divisionbeing relatively associated in circuits operatable either by the cuttingof the, conductors of the main division or' the action of heat or flame upon the conductors of the thermostatic division, whereby eitherdivision is protected by the action of the other independent ,of its owneprotective characteristics. r

8. An electric cable for alarm systems,

comprising a thermostatic portion constisounding of the alarm by the action of heat, a main outer portion constituting a division of the cable supplementary to said thermostatic portion and exterior thereof and surrounding the same and embodying the circuit conductors which are operatable to cause the sounding of the alarm by severance of the conductors, the conductors of the thermostatic portion and the conductors of the suplementary outer portion being relative y arranged in circuits having open and closed cable andcembodying the circuit conductors which are thermostatically operatable to cause the sounding of the alarmby the action of heat and -a main outer portion constituting a division of the cable supplementary to said thermostatic portion and exterior thereof and surrounding the same and embodying electrical conductors of relatively fine wire operatable to sound the alarm by the severance of the-conductors and are thermostatically operatableto cause the wound aroundsaid thermostatic portion, and r a frangible coating covering the conductors of said outer portion, the conductors of the thermostatic core portion and the conductors of the supplementary outer portion "being relatively arranged in circuits operatable either by theicutting of the conductors or the action of heat or flame, substantially as and for the purpose set forth.

10. An electric cable for alarm systems, comprising in combination. a thermostatic portion constituting the thermostatic division of the cable and embodying the circuit conductors for short circuiting an alarm circuitby fusing, and a main portion constituting a division of the cable distinct from and supplementary to said thermostatic portion and embodying electrical conductors for operating an alarm circuit by cutting or severance of said conductors.

11. An electric cable for alarm systems, comprising in combination .a thermostatic portion constituting the thermostatic division of the cable and embodying electricaltconductors in connection with signal or alarm circuits operatable by fusing or'contact of said conductors, and a mam portlon constitutmg a division of the cable dlstmct from and supplementary to said thermostatic portion and embodying electrical conductors in connection with the same signal or alarm circuits and operatable by cutting of said conductors, substantially as and for the purpose set forth.

12. An electric cable for alarm systems, comprising in combination a main portion constituting a distinct division of the cable and embodyin electrical conductors in connection with c osed parts of signal or alarm clrcuits, whereby the cutting or severing of said conductors will open said circuits, and a tion constituting a distinct division of the cable and embodying electrical conductors in connection with closed parts of signal or alarm circuits, whereby the cutting or severing of said conductors will open said circuits,

and a thermostatic portion constituting an additional thermostatic division of the cable surrounded by and extending centrally within said mainportion' and embodying electrical conductors so arranged in connection with said signal or alarm circuits that the action of heat or flame will cause the short circuiting of part of said circuits and sound the si a1 or alarm independent of the severing 0 the electrical conductors of said outer portion of the cable, substantially as and for the purpose set forth.

14. An electric cable for alarm systems, comprising a thermostatic portion,'as at'T, constituting the thermostatic division of the cable and embodying the electrical conductors 1 and 4 connected with signal or alarm circuits and thermostatically operatable to cause the sounding of the alarmby the action of heat, and a main portion, as at'E, constituting a distinct division of the cable supplementary to said thermostatic portion and embodying electrical conductors connected with signal or alarm circuits and opcratable to cause the sounding of the alarm by severance of said conductors.

In testimony whereof I have signed my name in the presence of the subscribing witnesses.

' JOHN P. WILLIAMS.

Witnesses:

L; Frmrcmo, Y O. J. Scmmssum. 

